Size Guide
To find your perfect fit, follow the simple steps below and use our UK ring size conversion chart.
How to Measure Your Ring Size at Home
1. Wrap a thin strip of paper or string around the base of the finger you will be wearing the ring on.
2. Mark the point where the paper or string overlaps itself.
3. Measure the length in millimetres using a ruler — this is your finger's circumference.
4. Compare your measurement to the chart below to find your UK ring size.
For the most accurate result, measure your finger at the end of the day when it is at its largest, and avoid measuring when your hands are cold, as fingers can shrink slightly in colder temperatures.
UK Ring Size Conversion Chart
| UK Size | US Size | EU Size | Diameter (mm) | Circumference (mm) |
|---|---|---|---|---|
| F | 3 | 44 | 14.1 | 44 |
| G | 3.5 | 45 | 14.5 | 46 |
| H | 4 | 46.5 | 14.9 | 47 |
| I | 4.5 | 47.5 | 15.3 | 48 |
| J | 5 | 49 | 15.7 | 49 |
| K | 5.5 | 50 | 16.1 | 51 |
| L | 6 | 51.5 | 16.5 | 52 |
| M | 6.5 | 52.5 | 16.9 | 53 |
| N | 7 | 54 | 17.3 | 54 |
| O | 7.5 | 55 | 17.7 | 56 |
| P | 8 | 56.5 | 18.1 | 57 |
| Q | 8.5 | 57.5 | 18.5 | 58 |
| R | 9 | 59 | 18.9 | 59 |
| S | 9.5 | 60 | 19.3 | 61 |
| T | 10 | 61.5 | 19.7 | 62 |
| U | 10.5 | 62.5 | 20.1 | 63 |
| V | 11 | 64 | 20.5 | 64 |
| W | 11.5 | 65 | 20.9 | 66 |
| X | 12 | 66.5 | 21.3 | 67 |
| Y | 12.5 | 68 | 21.8 | 68 |
| Z | 13 | 69 | 22.2 | 70 |
If you are between two sizes, we recommend choosing the larger size for comfort. If you have any questions about sizing, please contact our team at support@authenticnanni.com and we will be happy to help.